器件名称: E-TDA7478AD
功能描述: SINGLE CHIP RDS DEMODULATOR
文件大小: 168.88KB 共8页
简 介:TDA7478
SINGLE CHIP RDS DEMODULATOR
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FEATURES
VERY HIGH RDS DEMODULATION QUALITY WITH IMPROVED DIGITAL SIGNAL PROCESSING HIGH PERFORMANCE, 57KHz BANDPASS FILTER (8th ORDER) FILTER ADJUSTMENT FREE AND WITHOUT EXTERNAL COMPONENTS PURELY DIGITAL RDS DEMODULATION WITHOUT EXTERNAL COMPONENTS RDS SIGNAL QUALITY OUTPUT 4.332MHz CRYSTAL OSCILLATOR(8.664MHz OPTIONAL) LOW NOISE CMOS TECHNOLOGY LOW RADIATION
Figure 1. Packages
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SO16
TSSOP16
Table 1. Order Codes
Part Number TDA7478D E-TDA7478AD Package SO16 TSSOP16
EBU (European Broadcasting Union) specifications. The device is made up of two sections: a cascaded antialiasing + switched capacitors 8th bandpass filter for precise RDS band selection and a demodulating section that performs the extraction od RDS data stream (RDDA) and clock (RDCL), to be further processed by a suitable RDS decoder. Output for RDS signal quality is also present.
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DESCRIPTION
The TDA7478 recovers the additional inaudible RDS information which is transmitted by FM radio broadcasting stations and operates in accordance with the Figure 2. Block Diagram
C1 27pF
4.332MHz
C2 47pF
T57 15 4 270pF 2nd ORDER ANTIALIASING FILTER
OSCIN 13
OSCOUT 14
MPX
5 OSCILLATOR & DIVIDER 9
OSEL FSEL
16 FILOUT 8 8th ORDER SC-BANDPASS FILTER 57KHz PLL 1187.5Hz PLL 7 1 VS 100nF VREF 10F INTEGRAL BIPHASE DEC. 3 + POLARITY BIPHASE DEC. 0 1 2 12 QUAL DET.
RDCL
N.U. QUAL
MUX
DIFF. DECODER
RDDA
10 TEST LOGIC
TM
6 GND
11 EXTRES
D03AU1490
November……
